Pendant for watch-cases



(No Model.)

T. A. HOPKINS. PENDANT FOR WATGHGASES.

No. 487,052. Patented Nov. 29, 1892 UNITED STATES PATENT OFFICE.

THOMAS A. HOPKINS, OF ELGIN, ASSIGNOR TO M. O. EPPENSTEIN & 00., OF CHICAGO, ILLINOIS.

PENDANT FOR WATCH-CASES.

SPECIFICATION forming part of Letters Patent No. 487,052, dated November 29, 1892.

Application filed July 19, 1892. Serial No. 440.469- (No model.)

To all whom it may concern.-

Be it known that I, THOMAS A. HOPKINS, residing at Elgin, Illinois, have invented certain new and useful Improvements in Pendants for VVatch-Cases, of which the following is a specification.

The object of my invention is to provide a watch-case pendant with a key having a rotary and a longitudinal motion and of such IO construction that the rotary motion of the same can be-used to wind the mainspring or set the hands of a watch-movement, and the longitudinal motion of the key can be used for shifting the stem-driven train into either of its two engagements-t. e.,the winding and setting engagements; and it consists in the arrangement and combination of parts hereinafter described and claimed.

In the drawings, Figure 1 is a vertical sectioual view of my improvement with the stem in its outer limit of motion, adapted to engage the stem-driven train of the watchmovement for the purpose of setting the hands. Fig. 2 is a similar view with the stem in its inner limit of motion, adapted to engage the watch-movement for the purpose of winding the mainspring. Figs. 3 and 4 are details of construction hereinafter described.

In making my improved pendant for watchcases I use a pendant A,with a circular opening extending axially through it into the center of the case. Screw-threaded into this opening is a bushing Bin sucha manner 5 that it can be readily adjusted in or out, as

desired. Extending centrally through this bushing is the key or stem arbor O,provided with the usual crown D at its outer end, and its inner end is provided with a square d,

which enters the usual winding-pinion Eof a watch-movement.

Mounted loosely on the stein-arbor is a spring-sleeve F, which pal-takes of but one of the motions of the stem-arborthe longitudinal motion-while permitting the key or stem arbor to rotate freely. This springsleeve is provided with a flange f at its lower end, and in which is a groove Gof such shape and size that it Will not permit the stem-arbor to be pulled out to its outer limit of longitudinal motion until considerable force is used, and when pulled out to such limit it springs over the edgeb of the threaded bushing and holds the key or stem arbor in such position, while permitting it to rotate freely 5 5 and operate the mechanism for setting the hands of the watch.

It can readily be seen from an inspection of the drawings that the shape of the groove G and the lower edge of the threaded bush- 6o ing are such that it does not require as much force to push the stem to its inner limit of motion, but when pushed in the faces of the flange and bushing prevent the stem from being drawn outward again until more than ordinary force is used.

It will be seen from the foregoing description of my invention that the key or stem arbor rotates freely and has no spring-pressure to create friction while being rotated, and having but one gr0ove'. e., that to hold it at its outer limit of motion, it can be used as readily with hunting-case watchesthat have case-springs, as with open-face watches, that have none; also, with a threaded bushing the parts can be readily adjusted to suit any of the well-known stem winding and setting Watch-movements.

I have shown, but not described, a watchmovement with a stem-driven train; but it forms no part of my invention, and any of the well-known forms of watch-movements can be used in connection with it. Neither do I wish to be understood as claiming this invention broadly, as I am aware that various devices have been patented for accomplishing the same results as my invention, but by altogether different means.

I claim- As an improvement in pendants for watch- 0 cases,the combination of a hollow pendant, a threaded bushing adj ustably secured therein,

a spring sleeve within said bushing and mounted rotatively on the stem-arbor and provided with a flange on one of its ends, said 5 flange having a groove adapted to spring over and engage one edge of the threaded bushing, and the longitudinally-rotatable stem-arbor, substantially as described.

THOMAS A. HOPKINS.

Witnesses:

. THos. F. SHERIDAN, THos. W. DUNCAN. 

